无钴铁基层状钙钛矿材料作SOFC阴极的研究

Study on Cobalt Free Iron Base Like Perovskite as Cathode of SOFC

陈茜 金莹 马季 张磊磊 宋昭远

Xi Chen Ying Jin Ji Ma Leilei Zhang Zhaoyuan Song

辽宁石油化工大学 理学院，辽宁 抚顺 113001

College of Science，Liaoning Petrochemical University，Fushun Liaoning 113001，China

通过溶胶凝胶一步法制备了铁基钙钛矿型复合阴极材料（Ruddlesden?Popper，RP），并对将其用作SOFC阴极的性能进行了评价。结果表明，经1 200 ℃煅烧后所制样品的组分是(La2/3Sr4/3)FeO4?(La4/3Sr8/3)Fe3O10 (LSF)；在400 ℃的空气中，样品的峰值电导率为57.0 S/cm；在800 ℃的空气中，该样品在La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM)电解质上的界面极化阻抗为0.198 Ω·cm2；基于300 μm厚LSGM支撑的单电池，该样品用作电池阴极时的峰值功率密度可达670 mW/cm2，且持续工作50 h性能无衰减；LSF阴极的电化学性能优异且稳定，是一种非常具有潜力的SOFC阴极材料。

The Ruddlesden?Popper (RP) perovskitetype composite cathode material was prepared by a sol?gel method,and the performance of using it as a SOFC cathode was evaluated.XRD result shows that the composite material calcined at 1 200 ℃ was (La2/3Sr4/3)FeO4?(La4/3Sr8/3)Fe3O10 (LSF).At 400 ℃,the highest conductivity of the sample is 57.0 S/cm in air.At 800 ℃,the interfacial polarization resistance of the LSF electrode on La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM) electrolyte is 0.198 Ω·cm2.Based on a single cell supported by a 300?μm?thick LSGM,the peak power density of the sample when used as a cell cathode was up to 670 mW/cm2 when used as the cathode of the cell, with no performance degradation for 50 h of continuous operation.Experiments show that the LSF cathode has excellent and stable electrochemical performance,and is a very promising cathode material for SOFC.

国家自然科学基金青年基金项目(62105132);辽宁省兴辽英才青年拔尖人才计划项目(XLYC1807179)

10.12422/j.issn.1006-396X.2023.04.010